<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>浮动去空格</title>
<style>
button { margin: 0; }
p { clear: both; }
</style>
</head>

<body>
<button>按钮1</button>
<button>按钮2</button>
<button>按钮3</button>
<button>按钮4</button>
<p><input type="button" id="trigger" value="点击按钮浮动"></p>
<script>
var trigger = document.getElementById("trigger"),
    buttons = document.getElementsByTagName("button");

var length = buttons.length;

if (trigger && length > 0) {
	trigger.onclick = function() {
		for (var index = 0; index < length; index += 1) {
			buttons[index].style["cssFloat" in trigger.style? "cssFloat": "styleFloat"] = "left";
		}
	};
}	
</script>
</body>
</html>